Gas welding and cutting tip



Dec. 30, 1952 l. CQWLES GAS WELDING AND CUTTING TIP 3119a J1 me 27, 1946 n III ll lllllllllll I AwW w M ll \illll INVENTOR. CoaJZes Il Ill-II lllfl l Patented Dec. 30, 1952 UNITED STATES PATENT OFFICE A W LDENZ AND TT NG H Irving Cowles, Chicago, Ill. appetites his 27, 1946, Serial No. 673,613

This invention relates to improvementsin gas discharge tips used in cuttingand welding metals by use of an inflammable gas and oxygen, and has for its general object-to provide a tip of this type which can be produced-cheaply and accurately and which; aside; from .low 'production-cost, presents specific advantages over prior art tips of the same general type, as pointedout particularly in the following specification;

In the accompanying drawings illustrating a tip constructed in accordance with the invention:

Fig. 1 is a fragmentary radial sectional View of the said tip with component parts thereof relatively positioned in readiness' for' permanent assembly.

Figs. 2 and 3 are views similar to Fig. 1 showing the end portion-sot the shell member of the tip contracted'into fluid tight association with the core member thereof tocomplete the permanent assembly of the structure.

Fig. 4 is view showing the left-hand end of the structure shown in Fig, 1 beforethe said end portion of the core member has been expanded, as shown in Fig. 2. r

Fig. 5 is a view similar to Fig. 4 showing the right-hand end of Fig. 1 before the right-hand end portion of the shell member has been contracted, as shown in Fig 3. i

Fig. 6 is a fragmentary radial sectional view of a middle portion of the structure:

The tip comprises a core member I having a central longitudinal bore 2 extending from its intake end to the annular shoulder 3 which is spaced from the discharge end and connects, at said shoulder, withthe smaller discharge end bore portion l.

Said intake end portion is cylindrical esternally to the annular shoulder 5 bordering a larger diameter portion 6 which extends to one end of a progressively enlargeddiameter (tapered) portion 1. The latter terminates in a cylindrical portion which is equipped with a long pitch shallow helical groove of'ade'pth about one-third or less than the diameter OrYgauge of their/ire of which the helical spring 8, engaged in said groove, is composed.

From the other end of said grooved portion, said core member I presents a surface portion 1 which is of progressively increasing outer diameter (tapered) to the annularly enlarged cylindrical portion l6 which is equipped with a hellcal groove in which a helicalwire 8 is engaged.

The outer tapered surface portion 3 of the member I z en s'i om h i t n l to the amas (oi. its-27.4

nular shoulder idof the enlarged discharge end portion llofjsaidmember l which is p'rovided with a seriesof equally spaced discharge ducts it.

The axes ofthegas delivery'ducts I i, intersect the axis of the bore portionief the core member I atva predetermined'point spaced from the-latter. h I e i i The intake ends of said duct-s l lare flared and the outlet ends thereof are bordered by an annular'surface- I5 perpendicular to their axes.

The helice ajcooperates" w ith the opposed surface portionof the bore of the shell'member E3 to provide'a helical'duct .l 5 connecting tliieannw lar fluid intake annular chamber l'l with'the chamber [2. The flow capacity of the helical duct I6 is far greater thanthe total fiow capacity of theductsl l. r

A' sleeve l3 equipped with a shallow annular flange 19 at its'out'er end, and with a larger diameter-flange ZSTat its other end; is disposed telescopicallyover the intake end'p'ortionof the core member I 'in engaging relation to the shouldei- 5,the shoulder engaging end of the flange 28 being beveled, and the inner end of said sleeve 2E1 abuts the shoulder 5. of core member I.

Theshellmernberf l3 is equipped with a cylindrical bor'e fromi'ts right-hand. extremity to the inner annular shoulder 2|, the diameter of said bore being substantially equal to the diameter of the annular shoulder lilofthe core member I.

From the shoulderfl to the shoulder-22, the bore of the shell member I3 is ofthediameter of the flange 19 of thefsleeve IBandab-uts-the outer end surface of the latter. i The said flange 20 ofthe sleeve i3. is of slightly smaller diameter than the bore of the shell member 13 to p'rovidean annular passage through which gas which is fed into the annular space 23. between the flanges l5. and 2B and the portion of the sleeve i8 lying; therebetween, may pass, said gas being fed through openings 2d in the sleeve member i3 from the annular space lying between the outer annular flanges 26 i and 270i said sleevemem'ber I3-.-

Openings 28 in the sleeve member i3, opposed to the beveled surface of the fia ngegfil, connect the annular space betweenthe'annular flange 28 of the sleeve member l-3 -andthe flange Eithereof, with the annularspace-or chamber [1;

The sleeve member 13 is equipped with. a flared m-outhtli.

In assembling the structure, the helice dis first mounted upon the core member I; said helice being oflength determined by the length of the grooved cylindrical,substantially middle portion of the core member I, the gauge of the wire of which the said helice is composed being such that the outer surface of the same contacts the opposed inner wall of the shell member I3.

The sleeve I8 is then mounted in place, and then the core member I is inserted into the sleeve member I3 to the position shown in Fig. 1.

The intake end portion of the core member I is then expanded suitably to effect fluid tight ass-ociation of the core member I with the sleeve member I3 at this point, and also to prevent the withdrawal of the core member I from the said sleeve member I3. The other end portion of the latter is then contracted, by means of a well-known swaging die, into fluid tight association with the flange II of the core member I to complete the permanent fluid tight association of the latter with the sleeve member I3.

The thus completed assembly is then connected detachably with a conventional fittin having a flared mouth with which the tapered surface portions of the flanges 26, 2'! and 29 of the structure are engaged fluid tightly for cooperation with said fitting to form annular chambers into which the gases to be supplied through the openings 24 and 28 are fed through valve controlled ducts of the said fitting, the latter being connected with the sources of supply of said gases, one such duct being arranged to supply oxygen to the duct of the core member I.

Gas, such as acetylene, is fed through the openings 24, and oxygen is fed through openings 28, and also into the intake end of the core member I.

It is most important that the flow of acetylene,

or other inflammable gas, fed through the openings 24 in the sleeve member I3, be metered accurately, the same being fed under a constant pressure through said openings. It has been sought, heretofore, to accomplish this metering by resort to providing a number of said openings 24 of very small diameter, such as one-fiftieth of an inch.

In the instant structure, the flow control member or flange of the sleeve I8 cooperates with the sleeve member I3 to provide an annular gas metering space 33, the flow capacity of which is less than the aggregate total flow capacity of the openings 24 which may, therefore, be of far larger diameter and fewer in number.

The helical duct I6 has a flow capacity as aforesaid less than the aggregate flow capacity of they said metering passage and said openings 23, but has a greater flow capacity than the total aggregate flow capacity of the discharge ducts I4. The duct I6 promotes intimate and thorough commingling of the gases as pointed out more particularly hereinafter.

The shape of the chamber I2 is important because the structure becomes very hot during use throughout the length of the flange II and along the adjacent portion of said chamber I2, which, because of the greater volume of its space, operates as an expansion chamber for the gases contained therein as they are heated prior to discharge through the ducts I 4.

Said chamber I2 operates, also, in some degree, as a storage chamber wherein the gas pressure is maintained more uniformly than is usual because that pressure is not affected instantly by any of the usually slight changes in pressure of the fluids Within the chamber IT.

The provision of the surface I 5 and I0 perpendicular to the axes of said ducts I4 is important o guard against any deflection of the gas jets discharged therefrom from their predetermined course.

The structure is operated exactly the same as all other tips intended for the same purposes.

The helice 8 is shown in Fig. 1 as fitting closely the helical groove in which it is engaged and also in contact throughout its entire length with the bore of the sleeve member I3, whereas, in actual practice, this is neither practical nor desirable for several reasons, one being that such a close, snug flt is almost impossible of attainment, and if attained, would offer too much frictional resistance to insertion of the core member I into the sleeve member I3; the second reason being that it is preferable that said helice, which may be and is made of copper wire of gauge which will fit loosely in place to allow of some flow of fluids past the same while the main volume of gas is flowing through the helical duct which it defines. Y

Thus the leakage flow, as it may be termed, last above referred to, is of advantage in that it is lateral to or at an angle to the main flow and operates to promote commingling of the gases flowing through said duct.

In Fig. 6, it will be noted this leak flow space is irregular, being, in some instances, through unoccupied helical groove space and in other instances between the bore of the sleeve I3 and the said helix 8 as indicated at points 3| and 32, respectively, in Fig. 6.

Said duct I6 is believed to operate also to prevent back firing into the chamber I! from the chamber I2, if such backfiring should occur.

Production cost compared with that of other tips is reduced appreciably by decrease in the total number of operations required and the differences in length of the borings needed, as will be appreciated fully by those skilled in the art, an additional advantage being obtained with respect to accuracy of convergence of the ducts I4 to the axis of the discharge end portion of the bore of the core member I.

I claim as my invention:

1. A nozzle piece for fluids comprising a shell member, a core member mounted within said shell member and bounding a flow chamber therebetween, said flow chamber having an upstream end and a downstream end, said shell member having provided therein a plurality of inlet means for a plurality of fluids, said inlet means being in communication with the flow chamber near the upstream end, helical means in a portion of the flow chamber for changing the direction of flow of a greater portion of the mixture of fluids to provide for better mixing within the flow chamber, and discharge means in communication with the downstream end of the flow chamber.

2. A nozzle piece for fluids comprising a shell member, a core member mounted Within said shell member and bounding a flow chamber therebetween, said flow chamber being elongated and having an upstream end and a downstream end, said shell member having provided therein a plurality of inlet means for a plurality of fluids, said inlet means being in communication with the flow chamber near the upstream end, means on the core member positioned in the flow chamber downstream of the fluid inlet means for accelerating the mixture of fluids as the fluids flow longitudinally through said flow chamber, helical means in the flow chamber for changing the longitudinal direction of flow of a greater portion of the accelerated mixture of fluids to provide for better mixing within-the flow chamber, means for redirecting the flow of the fluid mixture into a longitudinal direction in the flow chamber, and discharge means in communication with the downstream end of the flow chamber.

3. A nozzle piece for fluids comprising a shell member, a core member mounted within said shell member and bounding aflow chamber therebetween, said flow chamber being elongated and having an upstream end and a downstream end, said shell member having provided therein a plurality of inlet means for a plurality "of fluids, said inlet means being inconmiuni-cation with the flow chamber at a region near "the upstream end, "one inlet means communicating with the flow chamber at a region further downstream than the other inlet means, means 'm'ountedin said flow chamber for regulating the flow of fluid, said means comprising membersmounted on said'core member and positioned between successive regions of'communicationof the plurality of inlet means with the flow chamber, helical means in a portion of the flow chamber for changing the longitudinal direction of flow of a portion of the mixture or" fluids to provide for better mixing within the flow chamber, said helical means for changing the longitudinal direction of flow comprising the core member having a helical groove in its surface, and a helical member adapted to t in said helical groove, the core member and shell member being spaced from each other so that the helical member bounds substantially longitudinal passageways between it and the bounding walls of the flow channeLand said helical member being restrained in the helical groove when in the final assembled position.

4. A nozzle piece for fluids comprising a shell member, a core member mounted within said shell member andbounding a flow chamber therebetween, said flow chamber being elongated and having an upstreamend and a downstream end, said shell member having provided therein a plurality of inlet means for a plurality of fluids, said inlet means being in oommunication'with the flow chamber at a region near the upstream end, one inlet means communicating with the flow chamber at a region further downstream than the other inlet means, means mounted in said flow cl'iainber for regulating the flow of fluid, said means comprising members mounted on said core member and positioned between successive regions of communication of the plurality of inlet means with the flow chamber, helical means in a portion of the flow chamber for changing the longitudinal direction of flow of a greater portion of the mixture of fluids to providefor better mixing within the flow chamber, discharge means in communication with the downstream endof the flow chamber, said discharge means comprising a. discharge flangemounted on said core member and bounding the downstream end of said flow chamber, said discharge flange having a plurality of discharge ducts therethrough, the axes of said ducts converging at a point spaced downstream from the discharge flange on said core member, and the faces of the discharge flange'being substantially at right angles to the axes ofsaid :discharge ducts.

5. A nozzle piece for fluids comprising a shell member, a core member mounted within said shell member and bounding a flow chamber therebetween, said flow chamber being elongated and having an upstream end and a downstream end, said shell member having provided therein a pair of inlet means for a plurality of fluids, the first inlet means being in communication with the flow chamber at a region-near the upstream end, the second inlet means communicating with the flow chamber at a region downstream from the first inlet means, means mounted in said flow chamber for regulating the flow of fluid, said means comprising a flow controlling member mounted on said core member "and positioned within the flow chamber between the successive regions of communication of the pair of inlet means with the flow chamber, means downstream of the flow-controlling member for accelerating the mixture of fluids as the fluids flow longitudinally through said flow chamber, helical. means in the flow chamber for-changing the longitudinal direction of flow of a greater portion of the accelerated mixture of fluids to provide for better mixing within the flow chamber, means: downstream of said helical means for redirecting the flow of fluid-mixture. into a longitudinal direction in the flow chamber and for decelerating the mixture of fluids, and discharge means incommunication with the downstream end of theflow chamber.

6. A nozzle piece for fluids comprising a-shell member, a core member, said core member and shell member both being bodies of revolution concentrically with the core member within the shell member and bounding an elongated annular flow chamber therebetween, .said core member having an axial passageway therethroughsaid annular flow chamber having an upstream end and a downstream end, said shell member having provided therein a first fluid inlet means in communication with the flow chamber near the upstream end, a second fluid inlet means communicating with the flow chamber at a region downstream of the first inlet means, fluid-flow controlling means mounted on said core member in the flow chamber between the first fluid inlet means and the second fluid inlet means, said flow chamber being bounded at the downstream end by an annular discharge flange mounted'on the end of said core member and in sealing engagement with said shell member, said annular discharge flange having a plurality of discharge ducts therethrough in communication with the downstream end of said flow chamber, the axes of said discharge ducts intersecting the axis of said core member at a point spaced downstream from the downstream'end of said core member, and the faces of the annular discharge flange being substantiallyat right angles-to the axes of said convergent discharge ducts.

7. A nozzle piece for fluids comprising a shell member, a core member, said core member and shell member both being bodies of revolution positioned concentrically with the core member within the shell member and bounding an elongated annular flow chamber therebetwecn, said core member having an axial passageway there through, said annular flow chamber having an upstream end and a downstream end, said shell member having provided therein afirst fluid inlet means in communication with the flow chamber near "the upstream end, a second fluid inlet means communicating with the flow chamber at a region'downstream of the first inlet means, fluid-flow controlling:meansmounted on said core member in the flow chamber between the first fluid inlet means and the second fluid inlet means, a portion oftheannular flow chamber downstream of'the flow controllingmeans being substantially a helical duct in which a greater portion of the fluid mixture is caused to flow in -a helicalpath, and fluid discharge-means in communication with the downstream end of the annular flow chamber. a

8. A nozzle piece for fluids comprising a shell member, a core member, said core member and shell member 'both being bodies of revolution positioned concentrically with the core member within the shell member and bounding an elongated annular flow chamber therebetween, said core member having an axial passageway therethrough, said annular flow chamber having an upstream end and a downstream end, said shell member having provided therein a first fluid inlet means in communication with the flow chamber near the upstream end, a second fluid inlet means communicating with the flow chamber at a region downstream of the first inlet means, fluid-flow controlling means mounted on said core member in the flow chamber between the first fluid inlet means and the second fluid inlet means, that part of the annular flow chamber downstream of the flow controlling means being a mixing region comprising in the direction passing downstream a longitudinal flow section of lessening flow area, a region of reduced flow area in which is positioned helical means for causing a greater portion of the mixture of fluids to flow in a helical path, and a region of increasing flow area in which the direction of flow is longitudinal, and fluid discharge means in communication with the downstream end of the annular flow chamber.

9. A nozzle piece for fluids comprising a shell member, a core member mounted within said shell member and bounding a flow chamber therebetween, said flow chamber having an upstream end and a downstream end, said shell member having provided therein a first fluid inlet means in communication with the flow chamber near its upstream end, a second fluid inlet means communicating with the flow chamber at a region downstream of the first inlet means, fluid flow controlling means mounted on the core member at a region downstream of the first inlet means and upstream of the second inlet means, a portion of the flow chamber downstream of the flow controlling means being substantially a helical duct in which a portion of the fluid mixture is caused to flow in a helical path, and discharge means bounding the downstream end of the flow chamber.

10. A nozzle piece for fluids comprising a shell member, a core member mounted within said shell member and bounding a flow chamber therebetween, said flow chamber having an upstream end and a downstream end, said shell member having provided therein a first fluid inlet means in communication with the flow chamber near its upstream end, a second fluid inlet means communicating with the flow chamber at a region downstream of the first inlet means, fluid flow controlling means mounted on the core member and positioned within the flow chamber at a region downstream of the first inlet means and upstream of the second inlet means, a portion of the flow chamber downstream of the flow controlling means being substantially a helical duct region of reduced flow area in which a greater portion of the fluid mixture is caused to flow in a helical path, and discharge means bounding the downstream end of the flow chamber.

11. A nozzle piece for fluids comprising a shell member, a core member mounted within said shell member and bounding a flow chamber therebetween, said flow chamber having an upstream end and a downstream end, said shell'member having provided therein a first fluid inlet means in communication with the flow chamber near its upstream end, a second fluid inlet means communicating with the flow chamber at a region downstream of the first inlet means, fluid flow controlling means mounted on the core member positioned within the flow chamber at a region downstream of the first inlet means and upstream of the second inlet means, a portion of the flow'chamber downstream of the flow controlling means being substantially a helical duct region in which a greater portion of the fluid mixture is caused to flow in a helical path, and discharge means bounding the downstream end of the flow chamber, the total flow capacity through said helical duct being greater than the total flow capacity of the discharge means.

12. A nozzle piece for fluids comprising a shell member, a core member mounted within said shell member and bounding a flow chamber therebetween, said flow chamber having an upstream end and a downstream end, said shell member having provided therein a first fluid inlet means in communication with the flow chamber near its upstream end, a second fluid inlet means communicating with the flow chamber at a region downstream of the first inlet means, fluid flow controlling means mounted on the core member and positioned within the flow chamber at a region downstream of the first inlet means and upstream of the second inlet means, a portion of the flow chamber downstream of the flow controlling means having positioned therein helical means for causing a portion of the mixture of fluids to flow in a helical path, said helical means being positioned between the core member and the shell member so as to form passageways therebetween which permit the remaining portion of the fluid mixture to pass in a substantially longitudinal direction through said passageways between said helical means and the bounding walls of the flow chamber, and discharge means bounding the downstream end of the flow chamber.

13. A nozzle piece for fluids comprising a shell member, a core member mounted within said shell member and bounding a flow chamber therebetween, said flow chamber having an upstream end and a downstream end, said shell member having provided therein a first fluid inlet means in communication with the flow chamber near its upstream end, a second fluid inlet means communicating with the flow chamber at a region downstream of the first inlet means, fluid flow controlling means mounted on the core member and positioned within the flow chamber at a region downstream of the first inlet means and upstream of the second inlet means, that part of the flow chamber downstream of the flow controlling means being a mixing region comprising in the direction passing downstream a longitudinal flow section of lessening flow area, a helical duct region of reduced flow area in which a greater portion of the mixture of fluids is caused to flow in a helical path, and a region of increasing flow area in which the flow is longitudinal, and discharge means bounding the downstream end of the flow chamber.

14. A nozzle piece for fluids comprising a shell member, a core member mounted within said shell member and bounding a flow chamber therebetween, said flow chamber having an upstream end and a' downstream end, said shell member having provided therein a first fluid inlet means in communication with the flow chamber near its upstreamend, ajsecondfluid inlet means communicating with the flow chamber at a reg-ion downstream of the first inlet means, fluid flow controlling means mounted on the core member and positioned within the flowchamber at a region downstream of the first inlet means and upstream of the second inlet means, that part of the flow chamber downstream of the flow controlling means being a mixing region comprising in the direction passing downstream a longitudinal flow section of lessening flow area, a region of reduced flow area in which is. positioned helical means for causing a greater portion of the mixture of fluids to flow in a helical path, and a region of increasing flow area in which the direction of flow is longitudinal, means for retaining said helical means in position in the flow chamber, and discharge means bounding the downstream end of the flow chamber.

15. A nozzle piece for fluids comprising a shell member, a core member mounted within said shell member and bounding a flow chamber therebetween, said flow chamber having an up stream end and a downstream end, said shell member having provided therein a first fluid inlet means, in communication with the flow chamber near its upstream end, a second fluid inlet means communicating with the flow chamber at a region downstream of the first inlet means, fluid flow control-ling means mounted on Y the core member and positioned within the flow chamber at a region downstream of the first inlet means and upstream of the second inlet means, that part of the flow chamberdownstream of the flow controlling means being a mixing region comprising in the direction passing downstream a longitudinal flow section of lessening flow area, a region of reduced flow area in which is positioned helical means for causing a portion of the mixture of fluids to flow in a helical path, and a region of increasing flow area in which the direction of flow is longitudinal; means for-retaining said helical means in; position in the flow chamber, said helical means being positioned between the core member and the shell member so as to form passageways therebetween which permit the remaining portion of the fluid mixture to pass in a substantially longitudinal direction through said passageways between said helical meansand the bounding walls of the flow chamher, and discharge means bounding the downstream end of'the flow chamber.

16. A nozzle piece for fluids comprising a shell member, a core member mounted Within said shell member and bounding a flow chamber therebetween, said flow chamber having an upstream end and a downstream end, said shell member having provided thereina first fluid inlet meansin communication with the flowchamber near its upstream end, a, secondflpid inlet means communicating with the flow chamber at a region downstream of the first inlet means, fluid flow controlling means mounted on the coremember and positioned between the first inlet means and the second inlet means, a portion of the flow chamber downstream of the flow controlling means being substantially a helical duct in which a portion of the fluid; mixture is caused to, flow in a helical path, saidrflow chamber being bounded at the downstream and by a discharge flange mounted on said core member and in sealing engagement with said shell member, said dis harge, flange hav n a. p ur l ty of dis 'il e ducts therethroush in communication wi h the downstream end of said flow chamber, and the 1o axes of said ducts converging at a point spaced downstream fromthe discharge flange on said core member.

17. A nozzle piece for fluids comprising a shell member, a core member mounted within said shell member and bounding a flow chamber therebetween, said flow chamber having an upstream end and a downstream end, saidv shell member having provided therein a first fluid inlet means in communication with the flow chamber near its upstream end, a second fluid inlet means communicating with the flow chamber at a. region downstream of the first inlet means, fluid flow controlling means mounted on the coremember and positioned between the first inlet means and the second. inlet means, a portion of the flow chamber downstream of the flow controllin means being substantially a helical ductin which a portion of the fluid mixture is caused to, flow in a helical path, said flow chamber being bounded at the downstream end by a discharge, flange mounted on said coremember and in sealing engagement with said shell member, said discharge flange. having, a plurality of discharge ducts therethrough incommunication with the down-. stream end of said flow chamber,.the axes of said ducts converging at; a point. spaced downstream from the discharge flange on said core. member, and the faces of the discharge. flange being substantialiy at right, angles to the axes oi said discharge ducts.

18. A nozzle piece. for fluids comprising a shell member, a core member mounted within said shell member and bounding a flow chamber therebetween, said flow chamber having an upstream end and, a downstream end, said shell member having provided therein a first fluid inlet means in communication with the flow h m r n ar its upstream e d, a second fluid inlet, means. c.0.mrnir icat nsv w th th fl w ham er a a re ion d wns eam of the first inlet means, a sleeve having a fluid flow controlling; flange thereon mounted on the core member, said, flange projecting into the flow chamber at a region downstream of the first inlet means and upstream of the, second: inle means, said flange being spaced from, the shell memb r so as to form a conn ctin p ssa eway municatin that D l Of h 10W Gh im fil. in direct communication with the first; ,inlet means and that part ofthe. flow chamber in direct communication with the second inlet m ans, that art of. the flow cham d w t m o h flow' contro ins fla e be ng a mixing chamber comprising in the, direction passing downstream a region of lessening flow area, a region of least flow area, and. region .of nc e sing flQ 3 11 said flow ch mber being houndedat tbetdownstr am. and, bya di char e fl n mount d on sai core member nd in sealing engagement withsaid shell, member, said discharge flange having a plurality of discharge ducts therethrough in communication with .the downstream end of; said flow. chamber, theqaxes of said ducts convergingat; a point ,spaced downstream from the discharge flan e on said core ember. a d the ac i the d scharge flange be su ta t a ly atrisbt an les-to theiaxesof sa d, di ch r e uct 19- A. st uc ur of: th ime snecifiedcomprisme a tubul r core memb neouinned at-its, dis? har nd with an externalannular flange, said flange having a plurality of ducts therethrough, the axes of said ducts converging to intersect the axis of said core. member at a point spaced from. the discharge end of the core member, a shell member rigid with said core member, said core member and shell member having an annular chamber therebetween, said shell member being provided at its inlet end with a pair of spaced fluid intake means in communication with the annular chamber, and a fluid-flow controlling member disposed within the chamber between the core member and the shell member at a region between said pair of spaced fluid intake means.

20. A structure, according to claim 19, wherein a helical member is positioned in said annular chamber cooperating with said core member and said shell member to form a helical duct in a portion of the chamber between the ends of said chamber, and the flow capacity of said helical duct being greater than the total aggregate flow capacity of said discharge ducts in the said external annular flange.

21. A structure of the type specified which comprises an elongated core member equipped with a longitudinal bore therethrough, said core member having an external flange at its discharge end, said flange having a plurality of gas discharge ducts axially convergent to intersect the axis of the longitudinal bore at a point spaced from the discharge end of the core member, a shell member rigidly mounted upon said core member at its ends and spaced therefrom between its ends so as to form an elongated and annular flow chamber between the shell member and the core member, said shell member being provided at the inlet end with a pair of fluid inlet means in communication with said flow chamber, said core member being enlarged so that the cross-sectional area of the core at a region between the ends of the core is increased so as to lessen the spacing between the shell member and the core member, said reduced spacing between the core member and shell member providing a restricted passage for fluid in the flow chamber from the intake means through the shell member to said convergent discharge ducts, said restricted passage being of greater cross-sectional area than said convergent discharge ducts and of less cross-sectional area than the cross-sectional area of the annular flow chamber between the core and shell members at any point between said restricted passage and said external flange. I

22. A structure of the type specified comprising an elongated core member equipped with a longitudinal bore therethrough, said core member being enlarged at a region between its ends, said core having at its discharge end an external annular flange having a plurality of fluid discharge ducts therethrough, a shell member rigidly secured at one end to said external flange and at the other end to said core member, said shell member having a plurality of fluid intake means therein adjacent the fluid intake end of the flow chamber, a fluid flow restricting member mounted on said core member and positioned in said flow chamber between the fluid intake means, and said fluid-flow restricting member substantially dividing said flow chamber into a plurality of connected fluid receiving chambers.

23. A structure, according to claim 22, wherein a helical member is mounted in said flow chamber adjacent the enlarged portion of said core member and cooperates with said shell member and said core member to form a helical duct in a portion of the flow chamber between the ends of said chamber, and said helical duct being of greater flow capacity than said fluid discharge ducts in the external annular flange of said core member.

24. A nozzle piece for fluids, comprising a shell member, a core member mounted within said shell member and bounding an interspace therebetween, said interspace having an upstream end and a downstream end, said shell member having provided therein a first fluid inlet means in communication with the interspace near its upstream end, a second fluid inlet means communicating with the interspace at a region downstream of the first inlet means, fluid flow controlling means occupying said interspace at a region downstream of the first inlet means and upstream of the second inlet means, a portion of the interspace downstream of the flow controlling means being substantially a helical duct in which a portion of the fluid mixture is caused to flow in a helical path, and discharge means bounding the downstream end of the interspace.

25. A nozzle piece for fluids, comprising a shell member, a core member mounted within and spaced from said shell member, the spaced surfaces of said core member and shell member bounding a flow chamber therebetween, said flow chamber having an upstream end and a downstream end, said shell member having provided therein a plurality of inlet means for a plurality of fluids, said inlet means being in communication with the flow chamber near the upstream end, helical means in a portion of the flow chamber for changing the longitudinal direction of flow of a portion of the mixture of fluids to provide for better mixing within the flow chamber, said helical means for changing the longitudinal direction of flow comprising a helical groove in one of said spaced surfaces bounding said flow chamber, and a helical member adapted to be positioned in said helical groove, said helical member bounding substantially longitudinal passageways between it and said bounding walls of the flow chamber.

26. A nozzle piece for fluids, comprising a shell member, a core member mounted within said shell member and bounding a flow chamber therebetween, said flow chamber having an upstream end and a downstream end, said shell member having provided therein a plurality of inlet means for a plurality of fluids, said inlet means being in communication with the flow chamber near the upstream end, and discharge means in communication with the downstream end of the flow chamber, said discharge means comprising a discharge flange mounted on said core member and bounding the downstream end of said flow chamber, said discharge flange having a plurality of discharge ducts therethrough, the axes of said ducts converging at a point spaced downstream from saiddischarge flange, and the faces of the discharge flange being substantially at right angles to the axes of said discharge ducts.

27. A nozzle piece for fluids, comprising a shell member, a core member mounted within said shell member and bounding an annular interspace therebetween, said interspace having an upstream end and a downstream end, said shell member having a first and a second fluid intake means therein, said second fluid intake means being spaced downstream of the first fluid intake means, said second intake means communicating directly with said annular interspace, a fluid flow restricting member positioned in said interspace at a point between said first and second fluid intake means for restricting the volume flow oi fluid 13 14 from said first intake means into the portion of UNITED STATES PATENTS eaid interspaee, downstream of said flow restricp- Number Name Date mg member, wherem the fiulds earned by sald 629,338 Chelmisky July 25, 1399 first and second fluid intake means are mixed. 1,365,600 et a1 Jan 11, 1921 n 1,369,545 Reynolds Feb. 22, 1921 IRVING COWLIJS- 1,373,329 Perdue Apr. 5, 1921 1,420,921 Godfrey June 27, 1922 1,483,467 Meden Feb. 12, 1924 REFERENCES CITED 1,631,007 Bucknam May 31, 1927 The following references are of record in the 2,253,340 Smith Oct. 7, 1941 file of this patent: 2,376,413 Babcock May 22, 1945 

